Armoring rods for reinforced concrete



Dec. 20, 1966 u. FINSTERWALDER 3,292,337

AHMORING RODS FOR REINFORCED CONCRETE Filed Nov. 4, 1963 2 Sheets-Sheet 1 AMI/V76? UL 470/ f/VSTEPWAADZA i) la Dec. 20, 1966 u. FINSTERWALDER 3,292,337

anmonme RODS FOR REINFORCED coucams Filed Nov. 4, 1963 2 Sheets-Sheet 2 Aer United States Patent 4 Claims. (21. 52-738) The invention relates to reinforcing means for con-- crete and is particularly concerned with armoring rods for reinforced concrete.

For thearmoring of reinforced concrete, particularly prestressed concrete, rods are known which are provided with helically extending ribs that are produced by hot rolling. These ribs are only located on one side of the rod and constitute parts of a thread that extends only along that part of the circumference of the rod and onto which an anchoring or connecting member, for example, a sleeve, is threaded which is provided with correspondingthreads. This shaping of an armoring rod can be obtained in a simple manner and economically by rolling operations during the production of the rod in the steel mill, in a manner that all chip removing or other processing and shaping operations for building a thread that is suitable for anchoring the forces on the rod are eliminated.

A rod of this type, however, can only be provided along one side with rolled on thread ribs owing to the fact that the synchronism between the upper and lower roller is disturbed after a short period of time, so that the other side of the rod must remain smooth and the rod can therefore not be subjected to the stresses and tensions that are permissible in connection with ribbed steel rods.

In reinforced concrete construction rods known generally as ribbed rods are already used for armoring. Such steel rods are profiled over their entire circumference in any desired manner. Due to the profiling, which as a rule is in the form of ribs extending transversely of the axis of the rod, the retention or adhesion of the steel in the concrete is improved to such an extent that the rod cannot only be subjected to greater tension or stress, but it is even possible to dispense with the hooks which are otherwise necessary for anchoring the rod.

It is an object of the invention to provide a rod which permits of threaded anchoring as well as also connections that depend on a threading effect, while at the same time it meets the requirements for ribbed steel as regards the improved retention in theconcrete. This problem is solved by an armoring rod which is provided with depressions along the side that is opposite that which possesses the hot rolled ribs, and which depressions form between them ribs of a height corresponding to the original surface of the rod and which are likewise produced by means of a rolling operation.

The depressions or recesses suitably extend in a direction opposite to the partial threads formed by the ribs.

The ribs that have remained between the depressions correspond in form and size substantially to the ribs that extend above the surface of the rod on the opposite side of the rod.

The armoring rod in accordanc with the invention provides the advantage that on one side of the rod a set of partial threads are available which, on the one hand, are available in the form of hot rolled ribs for threading on anchoring bodies or connecting members such as in the form of sleeves having suitably formed threads therein, and which, on the other hand, makes possible the utilization of the rods as ribbed steel rods ice for the armoring of reinforced concrete by virtue of the depressions that are provided on the other side of the rod. Although the depressions increase the retaining effect of the rod in the concrete by virtue of the ribs that have remained between them, they do not interfere with threading on anchoring or connecting elements. The latter actually engage the smooth surfaces of the rod which correspond to the original rod surface.

'Further features and advantages of the invention will become apparent by reference to the accompanying drawings which illustrate an embodiment of a reinforcing rod in accordance with the invention, and in which:

FIG. 1 is a perspective view of a portion of a reinforcing rod in accordance with the invention,

FIG. 2 shows a cross section through the rod,

FIG. 3 is a section along line IIIIII of FIG. 2; and

FIG. 4 is a section taken along line IV-IV of FIG. 2.

The armoring rod 1 is provided on its upper side with ribs 2 which are already produced during the rolling of the rod by suitable grooving of the rollers. The ribs extend substantially along one-half of the circumference of the rod.

Along the side of the rod surface which is disposed opposite the ribs, depressions or recesses 3 are provided which extend in the same manner as the ribs 2 only over a part of the circumference of the armoring rod. The forming of the ribs and of the depressions is clearly shown in the cross sections illustrated in FIGS. 2 and 3.

The depressions 3 result in the forming of rib-like projections between them, the height of which corresponds to the height of the original rod surface. If the ribs 2 that are provided on the top side of the rod form parts of a thread, then the depressions 3 and therefore also the ribs 4 have suitably an oppositely directed pitch. In this manner it is accomplished that when anchoring or connecting elements such as sleeves are used which must have a complete internal thread, the ribs that correspond to the original rod surface cross substantially with the threaded ribs of the internal thread of the sleeve and thus insure unimpeded threading and a proper and secure fit. Additional advantages can be obtained in this connection if the inclination or pitch of the depressions 3 with respect to the axis of the rod or of the ribs that have re mained therebetween is smaller than the pitch of the ribs 2 of the partial thread.

Having now described my invention with reference to the embodiment illustrated in the drawings, I do not wish to be limited thereto, but what I desire to protect by Letters Patent of the United States of America is set forth in the appended claims.

I claim:

1. Armoring rod for reinforced concrete, said rod having two sides, one said side presenting a plurality of rolled ribs forming parts of a helical thread along one portion of the circumference of said rod, said thread being adapted to receive an internally threaded body, the other said side opposite said side presenting said ribs having depressions, said depressions defining between them lands or ribs of a height corresponding essentially to the original surface of said rod.

2. Armoring rod for reinforced concrete, said rod having two sides, one said side presenting a plurality of rolled ribs forming parts of a helical thread along one portion of the circumference of said rod, said thread being adapted to receive an internally threaded body, the other said side opposite said side presenting said ribs having depressions, said depressions defining between them lands or ribs of a height corresponding essentially to the original surface of said rod, said rolled ribs extending obliquely to the axis of said rod and said lands or ribs extending in a direction opposite to the direction of said rolled ribs.

3. Armoring rod for reinforced concrete, said rod having two sides, one said side presenting a plurality of rolled ribs forming parts of a helical thread along one portion of the circumference of said rod, said thread being adapted to receive an internally threaded body, the other said side opposite said side presenting said ribs having depressions, said depressions defining between them lands or ribs of a height corresponding essentially to the original surface of said rod, said rolled ribs extending obliquely to the axis of said rod and said lands or ribs extending in a direction opposite to the direction of said rolled ribs, and the pitch of said depressions relative to the axis of said rod being smaller than the pitch of said ribs forming said parts of a helical thread.

4. Armoring rod for reinforced concrete having conformations of opposite sides thereof defining an interrupted helical thread, said conformations on one side of said rod being ribs defining a thread adapted to receive an internally threaded body and said conformations on the other side of said rod being depressions defining between 4 7 them lands or ribs disposed at the height of the original rod surface.

References Cited by the Examiner UNITED STATES PATENTS 815,620 3/1906 Mueser 52738 2,078,434 4/ 1937 Wise 72366 2,957,240 10/1960 Bnandes et a1. 29-193 FOREIGN PATENTS 570,435 9/1958 Belgium.

505,850 9/1954 Canada. 1,119,999 4/1956 France.

N. 76,991 11/1961 France.

(1st Add. to 1,241,156)

818,833 8/1959 Great Britain.

' 303,187 11/ 1954 Switzerland.

FRANK L. ABBOTT, Primary Examiner.

20 J. L. RIDGILL, Assistant Examiner. 

1. ARMORING ROD FOR REINFORCED CONCRETE, SAID ROD HAVING TWO SIDES, ONE SAID SIDE PRESENTING A PLURALITY OF ROLLED RIBS FORMING PARTS OF A HELICAL THREAD ALONG ONE PORTION OF THE CIRCUMFERENCE OF SAID ROD, SAID THREAD BEING ADAPTED TO RECEIVE AN INTERNALLY THREADED BODY, THE OTHER SAID SIDE OPPOSITE SAID SLIDE PRESENTING SAID RIBS HAVING DEPRESSIONS, SAID DEPRESSIONS DEFINING BETWEEN THEM LANDS OR RIBS OF A HEIGHT CORRESPONDING ESSENTIALLY TO THE ORIGINAL SURFACE OF SAID ROD. 